Can you find out the missing number in the grid?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you find out the number of the parking space in which the car is parked?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Why do people go to bed?